"We only talk now about how we can beat this Portuguese team with all these amazing players they have," the German told reporters.

"This is our goal and we believe in it and believe we can go to Manaus and beat them. We want to get in the next round and, if it takes beating Portugal, then this is what we have to do."

Klinsmann was unwilling to reveal his plans to cope with the injured Altidore should the 24-year-old be confirmed unfit.

"I don't want to go too deep into details because obviously we want Portugal to guess a little bit as well but, when one of your key players is not available, does it change certain things? Absolutely it does," he said.